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An echelle spectrometer has one low groove density grating (echelle) and one high groove density grating. https://en.wikipedia.org/wiki/Echelle_grating After the echelle grating there will be many orders … On the spectrogram, In vertical directions are the different orders from the low groove density echelle grating. In horizontal is the dispersion from the high groove density grating. …

In echelle spectrographs, the presence of echelle gratings and cross-dispersers is common. What task does each one perform? Why are the cross-dispersers needed? …

I am trying to make an educational echelle spectrograph using easily available materials, basically in a cardboard box. … Simply illuminate the echelle and view it via prism. The problem starts with any other light source such as a fluorescent lamp. …

I've been reading on the subject and constantly find that in astronomy Echelle spectrometers are used. I've also found that greater order separation favors long slit spectroscopy. Why is this? …

angles to the spectrum produced by the echelle grating. … Here is an illustration from this paper to illustrate this 2D output from an echelle spectrograph. …

Thus you cannot do "long slit" echelle spectroscopy unless you have a large order separation in the vertical direction. … The picture below shows an echellogram for the bHROS echelle spectrograph on the Gemini S telescope. The cross-disperser is a set of fused silica prisms. …

Using one of my homemade echelle spectrographs and a helium discharge tube, here is the two dimensional spectrum, called an echellogram, that I acquired for the light from a helium discharge tube: The … This just makes it easier to see where the spectral lines are located in the echelle grating’s diffraction orders. …

So, collecting light from the energized hydrogen discharge tube, and dispersing it using one of my homemade echelle spectrographs results in the following two dimensional spectrum (an echellogram): I … Each is present twice, in consecutive echelle grating orders, as a consequence of how echelle spectrographs may operate. …

One echelle grating will mix up all the wavelengths because at a position where there is a maximum for the $25^{\rm th}$ order “red” of wavelength $800 \,\rm nm$ there may be a maximum for the $50^{\rm …

of my echelle spectrographs. … Using the echelle spectrograph shown here, it is easy to spectrally disperse the light from a desired light source. …

The next photo shows how the white light from the flashlight is input to the fiber optic and collimator of a homemade echelle spectrograph. … The echelle spectrograph disperses the light arriving through its fiber optic input cable and produces an echellogram, i.e., a two dimensional spectrum. …

HARPS, like other high-precision spectragraphs, is of the echelle variety. …

This employs the same echelle spectrograph used in a number of radial velocity surveys. …